could swirl
Regular verb: swirl - swirled- swirled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could swirl
you could swirl
he could swirl
we could swirl
you could swirl
they could swirl 	I could be swirling
you could be swirling
he could be swirling
we could be swirling
you could be swirling
they could be swirling	I could have swirled
you could have swirled
he could have swirled
we could have swirled
you could have swirled
they could have swirled	I could have been swirling
you could have been swirling
he could have been swirling
we could have been swirling
you could have been swirling
they could have been swirling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't swirl
you couldn't swirl
he couldn't swirl
we couldn't swirl
you couldn't swirl
they couldn't swirl 	I couldn't be swirling
you couldn't be swirling
he couldn't be swirling
we couldn't be swirling
you couldn't be swirling
they couldn't be swirling	I couldn't have swirled
you couldn't have swirled
he couldn't have swirled
we couldn't have swirled
you couldn't have swirled
they couldn't have swirled	I couldn't have been swirling
you couldn't have been swirling
he couldn't have been swirling
we couldn't have been swirling
you couldn't have been swirling
they couldn't have been swirling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I swirl?
could you swirl?
could he swirl?
could we swirl?
could you swirl?
could they swirl? 	could I be swirling?
could you be swirling?
could he be swirling?
could we be swirling?
could you be swirling?
could they be swirling? 	could I have swirled?
could you have swirled?
could he have swirled?
could we have swirled?
could you have swirled?
could they have swirled? 	could I have been swirling?
could you have been swirling?
could he have been swirling?
could we have been swirling?
could you have been swirling?
could they have been swirling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I swirl?
couldn't you swirl?
couldn't he swirl?
couldn't we swirl?
couldn't you swirl?
couldn't they swirl? 	couldn't I be swirling?
couldn't you be swirling?
couldn't he be swirling?
couldn't we be swirling?
couldn't you be swirling?
couldn't they be swirling? 	couldn't I have swirled?
couldn't you have swirled?
couldn't he have swirled?
couldn't we have swirled?
couldn't you have swirled?
couldn't they have swirled? 	couldn't I have been swirling?
couldn't you have been swirling?
couldn't he have been swirling?
couldn't we have been swirling?
couldn't you have been swirling?
couldn't they have been swirling?